[PATCH v4 4/6] powerpc/traps: Print VMA for unhandled signals

[Murilo Opsfelder Araujo]

This adds VMA address in the message printed for unhandled signals,
similarly to what other architectures, like x86, print.

Before this patch, a page fault looked like:

  pandafault[61470]: unhandled signal 11 at 100007d0 nip 1000061c lr 
7fff8d185100 code 2

After this patch, a page fault looks like:

  pandafault[6303]: segfault 11 at 100007d0 nip 1000061c lr 7fff93c55100 code 2 
in pandafault[10000000+10000]

Signed-off-by: Murilo Opsfelder Araujo <muri...@linux.ibm.com>
---
 arch/powerpc/kernel/traps.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 4503e22f6ba5..bcefbb1ee771 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -96,6 +96,19 @@ EXPORT_SYMBOL(__debugger_fault_handler);
 #define TM_DEBUG(x...) do { } while(0)
 #endif
 
+static const char *signame(int signr)
+{
+       switch (signr) {
+       case SIGBUS:    return "bus error";
+       case SIGFPE:    return "floating point exception";
+       case SIGILL:    return "illegal instruction";
+       case SIGSEGV:   return "segfault";
+       case SIGTRAP:   return "unhandled trap";
+       }
+
+       return "unknown signal";
+}
+
 /*
  * Trap & Exception support
  */
@@ -317,9 +330,13 @@ static void show_signal_msg(int signr, struct pt_regs 
*regs, int code,
        if (!show_unhandled_signals_ratelimited())
                return;
 
-       pr_info("%s[%d]: unhandled signal %d at %lx nip %lx lr %lx code %x\n",
-               current->comm, current->pid, signr,
+       pr_info("%s[%d]: %s (%d) at %lx nip %lx lr %lx code %x",
+               current->comm, current->pid, signame(signr), signr,
                addr, regs->nip, regs->link, code);
+
+       print_vma_addr(KERN_CONT " in ", regs->nip);
+
+       pr_cont("\n");
 }
 
 void _exception_pkey(int signr, struct pt_regs *regs, int code,
-- 
2.17.1